B757 crew had an EICAS message on taxi out.

Attributes
ACN	441700
Time
Date	199906
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phx.airport
State Reference	AZ
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 5000
ASRS Report	441700
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Supplementary
Primary Problem	Ambiguous

Narrative:

I was taxiing for takeoff when I got a status message reading 'elevator PCU.' I stopped taxi and called maintenance control after making an entry in the logbook. They instructed me attempt to erase the status message by pushing the 'automatic, erase' buttons on the maintenance panel in the cockpit. We erased the message as instructed and maintenance control gave me a deferred item which I entered in the logbook. We then took off.

Original NASA ASRS Text

Title: B757 CREW HAD AN EICAS MESSAGE ON TAXI OUT.

Narrative: I WAS TAXIING FOR TKOF WHEN I GOT A STATUS MESSAGE READING 'ELEVATOR PCU.' I STOPPED TAXI AND CALLED MAINT CTL AFTER MAKING AN ENTRY IN THE LOGBOOK. THEY INSTRUCTED ME ATTEMPT TO ERASE THE STATUS MESSAGE BY PUSHING THE 'AUTO, ERASE' BUTTONS ON THE MAINT PANEL IN THE COCKPIT. WE ERASED THE MESSAGE AS INSTRUCTED AND MAINT CTL GAVE ME A DEFERRED ITEM WHICH I ENTERED IN THE LOGBOOK. WE THEN TOOK OFF.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.